A low voltage analysis platform for transformer substations based on digital model

Abstract

The present invention discloses a low-voltage analysis platform for a substation based on a digital model, including a substation simulation platform, wherein the substation simulation platform includes a model building unit, a data monitoring unit, a model control unit, and a substation adjustment unit, wherein the model building unit is used to build a three-dimensional simulation model based on real substation information, and the model building unit is connected with the data monitoring unit. The present invention relates to the field of intelligent power consumption technology for power grids. The substation low-voltage analysis platform based on a digital model establishes a three-dimensional simulation model based on real substation information, collects real voltage and current information of substation lines, and uses the three-dimensional simulation model to calculate actual resistance, thereby providing accurate and effective data support for the analysis of low voltage conditions, and can also automatically adjust the output voltage of the transformer according to the normal voltage to ensure the normal operation of the substation power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent power consumption in power grids, and in particular to a low-voltage analysis platform for a substation based on a digital model. Background Art

[0002] The substation in the power grid is to clearly define the power supply area covered by a certain transformer, which is of great significance to the management of the power grid. With the development of smart grids, the construction of digital substations has also become a trend. Digital substations use advanced technical means, such as monitoring terminal equipment for distribution transformers, to achieve real-time monitoring and data analysis of voltage, current, harmonics, temperature and humidity, etc., to improve the management efficiency and power supply quality of the substation.

[0003] However, with the use, low voltage in the substation is still prone to frequent occurrence. Generally, low voltage in the substation includes: long-term low voltage, such as insufficient power supply capacity of the power grid; seasonal low voltage, such as intensive cooling in summer and intensive heating in winter; low voltage caused by hardware, such as excessive power supply radius and large line resistance; and low voltage caused by management and regulation, such as incomplete voltage monitoring points, incomplete understanding of substation voltage, and inability to achieve coordinated linkage management of voltage.

[0004] For example, a method and device for analyzing the causes of low voltage in substations as described in application number CN201410398065.6 establishes a mathematical model of the distribution transformer, calculates the upstream voltage of the distribution transformer, calculates the voltage drop of the distribution transformer, establishes a mathematical model of the line, calculates the line voltage drop based on the mathematical model of the line, and determines the cause of the low voltage in the substation based on the upstream voltage of the distribution transformer, the voltage drop of the distribution transformer and the line voltage drop, thereby achieving quantitative analysis of the causes of low voltage in the substation and improving the accuracy of the analysis of the causes of low voltage in the substation. Although it can analyze the causes of low voltage, it is limited to an ideal state and deviates greatly from the actual results.

[0005] Based on the retrieval of the above information, it can be seen that simple mathematical models cannot provide accurate and effective data support for the analysis of low voltage in substations. For this reason, a substation low voltage analysis platform based on a digital model is proposed. A three-dimensional simulation model is constructed based on the real information of the substation. By laying current and voltage sensors on the substation lines, the actual data of line operation can be collected. While providing accurate and reliable data for the analysis of the causes of low voltage, the low voltage situation in the substation can also be automatically corrected. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the shortcomings of the prior art, the present invention provides a low-voltage analysis platform for substations based on a digital model, which solves the problem that a simple mathematical model cannot provide accurate and effective data support for the analysis of low voltage in substations.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-voltage analysis platform for substations based on digital models, including a substation simulation platform, the substation simulation platform including a model building unit, a data monitoring unit, a model control unit and a substation adjustment unit, the model building unit is used to build a three-dimensional simulation model according to real substation information, the model building unit is connected with the data monitoring unit, the data monitoring unit is used to mark nodes of substation lines in the three-dimensional simulation model, and collect voltage and current information at corresponding node marks in the substation lines, the model building unit is connected with the model control unit, the model control unit is used to perform simulation tests in the three-dimensional simulation model according to the collected voltage and current information, the model control unit is connected with the substation adjustment unit, and the substation adjustment unit is used to automatically adjust the transformer according to the simulation test results.

[0010] The present invention is further configured as follows: the model building unit includes a data acquisition module and a modeling interaction module, and the data acquisition module is connected to the modeling interaction module.

[0011] The present invention is further configured as follows: the data acquisition module is used to collect the laying path, length, branch information of the substation line, the transformer location and its voltage regulation range information, as well as the line material information and the diameter of the line conductor as real substation information.

[0012] The modeling interaction module is used to build a three-dimensional simulation model of human-computer interaction based on real station area information.

[0013] The present invention is further configured as follows: the data monitoring unit includes an area division module and a voltage acquisition and transmission module, and the area division module is connected to the voltage acquisition and transmission module.

[0014] The present invention is further configured as follows: the substation division module is used to mark nodes at line branches in the three-dimensional simulation model, and divide the node marks into total node marks on the trunk line and branch node marks on the branch line.

[0015] The voltage acquisition and transmission module is used to arrange voltage sensors and current sensors at the output end of the transformer and the end of the branch line, and to arrange voltage sensors and current sensors in the substations corresponding to the main node mark and the branch node mark, to collect real-time voltage and current information on the output end of the transformer, the main line, the branch line and the end of the branch line, and to transmit the collected voltage and current information to the three-dimensional simulation model.

[0016] The present invention is further configured as follows: the model control unit includes a power consumption simulation module, a line diagnosis module and a loss analysis module, the power consumption simulation module is connected to the line diagnosis module, and the line diagnosis module is connected to the loss analysis module.

[0017] The present invention is further configured as follows: the power consumption simulation module is used to formulate three groups of test input voltages A, B, and C and test comparison voltages to perform simulation tests:

[0018] Group A includes: using the voltage information collected at the output end of the transformer as the test input voltage, and using the voltage information collected at the main node mark corresponding to the trunk line as the test comparison voltage;

[0019] Group B includes: for using the voltage information collected at the main node mark as the test input voltage, and using the voltage information collected at the branch node mark corresponding to the main node mark as the test comparison voltage;

[0020] Group C includes: also used to use the voltage information collected at the branch node mark as the test input voltage, and the voltage information collected at the end of the corresponding branch line as the test comparison voltage;

[0021] The line diagnosis module is used to set a voltage error threshold as a standard threshold, input three groups of test input voltages into the three-dimensional simulation model respectively, calculate the ideal voltage corresponding to the three groups of test comparison voltage collection points according to the line material information and the diameter of the line conductor, calculate the difference between the ideal voltage and the test comparison voltage, and compare the absolute value of the difference with the standard threshold. When the absolute value of the difference is less than or equal to the standard threshold, it is judged that the corresponding line of the group is normal. On the contrary, when the absolute value of the difference is greater than the standard threshold, it is judged that the corresponding line of the group is abnormal, and after marking the abnormal line, an abnormal alarm is issued.

[0022] The loss analysis module is used to calculate the actual resistance of the abnormal line when a line abnormality occurs:

[0023] P1=V1*I

[0024] P2=V2*I

[0025] P3=P2-P1

[0026] Where, P1 is the input power, V1 is the test input voltage, I is the current, P2 is the output power, V2 is the test comparison voltage, and P3 is the power loss.

[0027] Calculate the actual resistance corresponding to group A circuit according to the power loss:

[0028] P3=I 2 *R

[0029] Where P3 is the power loss, I is the current, and R is the actual resistance.

[0030] The present invention is further configured as follows: the station area adjustment unit includes a data recording module, a voltage adjustment module and an alarm module, the data recording module is connected to the voltage adjustment module, and the voltage adjustment module is connected to the alarm module.

[0031] The present invention is further configured as follows: the data recording module is used to record simulation test information corresponding to the collected voltage and current information, the test debugging information includes input voltage, test comparison voltage and ideal voltage, and obtains the line safe transmission voltage range value based on the line material information, the diameter of the line conductor and the line length.

[0032] The voltage adjustment module is used to adjust the test comparison voltage to a normal voltage value as a target value according to the actual resistance, calculate the ideal test input voltage, and determine whether the ideal test input voltage is within the safe transmission voltage range of the corresponding line. If so, calculate the absolute value of the difference between the ideal test input voltage and the test input voltage to obtain the adjusted voltage value, and adjust the transformer output voltage according to the adjusted voltage value. If not, directly issue a low voltage alarm.

[0033] The alarm module is used to determine whether the adjusted voltage value exceeds the transformer voltage regulation range. When the adjusted voltage value does not exceed the transformer voltage regulation range, the transformer is adjusted. When the adjusted voltage value exceeds the transformer voltage regulation range, the transformer is no longer adjusted and a low voltage alarm is issued.

[0034] The present invention also discloses a method for using a low voltage analysis platform for a substation based on a digital model, which specifically includes the following steps:

[0035] S1. Use the data acquisition module to collect the laying path, length, branch information of the substation line, the location of the transformer and its voltage regulation range information, as well as the line material information and the diameter of the line conductor, as the real substation information. Based on the real substation information, a three-dimensional simulation model of human-computer interaction is built through the modeling interaction module.

[0036] S2. Mark the nodes at the line branches in the three-dimensional simulation model through the substation division module, and divide the node marks into total node marks on the trunk line and branch node marks on the branch line. Arrange a voltage acquisition and transmission module composed of a voltage sensor and a current sensor at the output end of the transformer and the end of the branch line, and arrange a voltage acquisition and transmission module composed of a voltage sensor and a current sensor in the substation corresponding to the total node mark and the branch node mark. Use the voltage acquisition and transmission module to collect real-time voltage and current information on the output end of the transformer, the trunk line, the branch line and the end of the branch line, and transmit the collected voltage and current information to the three-dimensional simulation model.

[0037] S3. In the three-dimensional simulation model, three groups of test input voltages A, B, and C and test comparison voltages are proposed through the power simulation module to conduct simulation tests:

[0038] Group A includes: using the voltage information collected at the output end of the transformer as the test input voltage, and using the voltage information collected at the main node mark corresponding to the trunk line as the test comparison voltage;

[0039] Group B includes: for using the voltage information collected at the main node mark as the test input voltage, and using the voltage information collected at the branch node mark corresponding to the main node mark as the test comparison voltage;

[0040] Group C includes: also used to use the voltage information collected at the branch node mark as the test input voltage, and the voltage information collected at the end of the corresponding branch line as the test comparison voltage;

[0041] The voltage error threshold is set as the standard threshold, and the three groups of test input voltages are respectively input into the three-dimensional simulation model using the line diagnosis module. According to the line material information and the diameter of the line conductor, the ideal voltage corresponding to the three groups of test comparison voltage collection points is calculated. After the difference between the ideal voltage and the test comparison voltage is calculated, the absolute value of the difference is compared with the standard threshold. When the absolute value of the difference is less than or equal to the standard threshold, the corresponding line of this group is judged to be normal. On the contrary, when the absolute value of the difference is greater than the standard threshold, the corresponding line of this group is judged to be abnormal. After marking the abnormal line, an abnormal alarm is issued. When a line abnormality occurs, the loss analysis module is used to calculate the actual resistance of the abnormal line.

[0042] S4. According to the actual resistance, the voltage adjustment module adjusts the test comparison voltage to the normal voltage value as the target value, calculates the ideal test input voltage, and determines whether the ideal test input voltage is within the safe transmission voltage range of the corresponding line:

[0043] Yes, calculate the absolute value of the difference between the ideal test input voltage and the test input voltage, obtain the adjustment voltage value, and adjust the voltage at the output end of the transformer according to the adjustment voltage value;

[0044] No, a low voltage alarm will be issued directly.

[0045] S5. Use the alarm module to determine whether the adjusted voltage value exceeds the transformer voltage regulation range:

[0046] When the adjusted voltage value does not exceed the voltage regulation range of the transformer, perform transformer regulation;

[0047] When the adjusted voltage value exceeds the voltage regulation range of the transformer, the transformer will no longer be adjusted and a low voltage alarm will be issued.

[0048] (III) Beneficial effects

[0049] The present invention provides a low voltage analysis platform for substations based on a digital model, which has the following beneficial effects:

[0050] (1) The present invention establishes a three-dimensional simulation model based on real substation information, collects real voltage and current information of the substation lines, and uses the three-dimensional simulation model to calculate the actual resistance. While providing accurate and effective data support for the analysis of low voltage conditions, the present invention can also automatically adjust the output voltage of the transformer according to the normal voltage to ensure the normal operation of the substation power grid.

[0051] (2) The present invention provides guidance for the analysis of low voltage conditions by means of abnormal marking. It also ensures the safe use of the line by comparing the ideal test input voltage with the safe transmission voltage range. It also implements self-check of whether automatic voltage regulation can be performed by calculating the adjustment voltage value and comparing it with the voltage regulation range of the transformer. When automatic regulation is not possible, an alarm is issued to prompt the operation and maintenance personnel to inspect the abnormal line to avoid the frequent occurrence of low voltage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a system principle block diagram of the present invention.

[0053] Figure 2 This is a system principle block diagram of the model building unit of the present invention.

[0054] Figure 3 This is a system principle block diagram of the data monitoring unit of the present invention.

[0055] Figure 4 It is a system principle block diagram of the model control unit and the station area adjustment unit of the present invention.

[0056] Figure 5 Schematic diagram of the distribution of node labels in an embodiment of the present invention.

[0057] In the figure, 1. Substation simulation platform; 2. Model building unit; 3. Data monitoring unit; 4. Model control unit; 5. Substation adjustment unit; 6. Data acquisition module; 7. Modeling interaction module; 8. Substation division module; 9. Voltage acquisition and transmission module; 10. Power consumption simulation module; 11. Line diagnosis module; 12. Loss analysis module; 13. Data recording module; 14. Voltage adjustment module; 15. Alarm module. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0059] See also Figure 1-5 , the embodiment of the present invention provides the following two technical solutions:

[0060] Embodiment 1

[0061] A low voltage analysis platform for a substation based on a digital model comprises a substation simulation platform 1 composed of a model building unit 2, a data monitoring unit 3 and a model control unit 4.

[0062] Among them, the model building unit 2 is used to build a three-dimensional simulation model based on the real substation information. Specifically, the model building unit 2 includes a data acquisition module 6 and a modeling interaction module 7. The data acquisition module 6 is used to collect the laying path, length, branch information of the substation line, the transformer location and its voltage regulation range information, as well as the line material information and the diameter of the line conductor as the real substation information.

[0063] The data acquisition module 6 is connected to the modeling interaction module 7, and the modeling interaction module 7 is used to build a three-dimensional simulation model of human-computer interaction based on real station area information.

[0064] As a preferred solution, in order to ensure that the three-dimensional simulation model can further fit the actual operation conditions of the substation, the model building unit 2 is connected to the data monitoring unit 3. The data monitoring unit 3 includes a substation division module 8 and a voltage acquisition and transmission module 9. The data monitoring unit 3 is used to mark the nodes of the substation lines in the three-dimensional simulation model, and to collect voltage and current information at the corresponding node marks in the substation lines. The substation division module 8 is used to mark the nodes at the line branches in the three-dimensional simulation model, and divide the node marks into total node marks on the trunk line and branch node marks on the branch line.

[0065] The substation division module 8 is connected to the voltage acquisition and transmission module 9. The voltage acquisition and transmission module 9 is used to deploy voltage sensors and current sensors at the output end of the transformer and the end of the branch line, and to deploy voltage sensors and current sensors in the substations corresponding to the main node mark and the branch node mark, to collect real-time voltage and current information of the transformer output end, the trunk line, the branch line and the end of the branch line, and transmit the collected voltage and current information to the three-dimensional simulation model.

[0066] As a detailed description, combine the following three groups of test input voltages A, B, and C and test comparison voltages, as shown in the attached Figure 5 As shown, the solid black circle is the voltage sensor and current sensor arranged at the output end of the transformer, the ellipse inclusion range is the node mark inclusion range, in the node mark inclusion range, the hexagon is the total node mark under the node mark, the circle is the branch node mark under the node mark, and the triangle is the voltage sensor and current sensor arranged at the end of the branch line. According to this design, the substation line layout can be simulated in a tree diagram, that is, the transformer output end is placed in the parent layer, and the subordinate sublayer is the total node mark corresponding to the hexagon connected according to the current direction; when the subordinate sublayer is the parent layer, its corresponding subordinate sublayer is the branch node mark corresponding to the circular mark connected according to the current direction, and so on, the simulation of the tree diagram can be completed, so as to facilitate the subsequent analysis and management of the low voltage situation in the substation.

[0067] As a preferred solution, the model building unit 2 is connected to the model control unit 4. The model control unit 4 is used to perform simulation tests in a three-dimensional simulation model according to the collected voltage and current information. The model control unit 4 includes a power simulation module 10, a line diagnosis module 11 and a loss analysis module 12. The power simulation module 10 is used to formulate three groups of test input voltages A, B, and C and test comparison voltages to perform simulation tests:

[0068] Group A includes: using the voltage information collected at the output end of the transformer as the test input voltage, and using the voltage information collected at the main node mark corresponding to the trunk line as the test comparison voltage;

[0069] Group B includes: for using the voltage information collected at the main node mark as the test input voltage, and using the voltage information collected at the branch node mark corresponding to the main node mark as the test comparison voltage;

[0070] Group C includes: also used to use the voltage information collected at the branch node mark as the test input voltage, and the voltage information collected at the end of the corresponding branch line as the test comparison voltage;

[0071] The power consumption simulation module 10 is connected to the line diagnosis module 11. The line diagnosis module 11 is used to set the voltage error threshold as the standard threshold, input the three groups of test input voltages into the three-dimensional simulation model respectively, calculate the ideal voltage corresponding to the three groups of test comparison voltage collection points according to the line material information and the diameter of the line conductor, calculate the difference between the ideal voltage and the test comparison voltage, and compare the absolute value of the difference with the standard threshold. When the absolute value of the difference is less than or equal to the standard threshold, it is judged that the corresponding line of the group is normal. On the contrary, when the absolute value of the difference is greater than the standard threshold, it is judged that the corresponding line of the group is abnormal. After marking the abnormal line, an abnormal alarm is issued.

[0072] The line diagnosis module 11 is connected to the loss analysis module 12. The loss analysis module 12 is used to calculate the actual resistance of the abnormal line when an abnormal line occurs:

[0073] P1=V1*I

[0074] P2=V2*I

[0075] P3=P2-P1

[0076] Where, P1 is the input power, V1 is the test input voltage, I is the current, P2 is the output power, V2 is the test comparison voltage, and P3 is the power loss.

[0077] Calculate the actual resistance corresponding to group A circuit according to the power loss:

[0078] P3=I 2 *R

[0079] Where P3 is the power loss, I is the current, and R is the actual resistance.

[0080] In this way, by calculating the actual resistance, effective reference data can be provided for whether the circuit is aging.

[0081] In this embodiment, the real voltage and current information of the substation is collected, and the actual resistance of the corresponding line is calculated, providing accurate and effective reference data for the low voltage analysis of the substation. For example, when the actual line resistance is large and causes low voltage problems, you can choose to shorten the power supply radius to reduce power loss, or choose to replace the line to reduce the actual resistance.

[0082] Embodiment 2

[0083] As an improvement of the previous embodiment, this embodiment is a low-voltage analysis platform for substations based on a digital model, and also includes a substation adjustment unit 5. The model control unit 4 is connected to the substation adjustment unit 5. The substation adjustment unit 5 is used to automatically adjust the transformer according to the simulation test results. The substation adjustment unit 5 includes a data recording module 13, a voltage adjustment module 14 and an alarm module 15. The data recording module 13 is used to record simulation test information corresponding to the collected voltage and current information. The test debugging information includes input voltage, test comparison voltage and ideal voltage, and the line safe transmission voltage range value is obtained according to the line material information, the diameter of the line conductor and the line length.

[0084] The data recording module 13 is connected to the voltage adjustment module 14. The voltage adjustment module 14 is used to adjust the test comparison voltage to a normal voltage value as a target value according to the actual resistance, calculate the ideal test input voltage, and determine whether the ideal test input voltage is within the safe transmission voltage range of the corresponding line. If so, the absolute value of the difference between the ideal test input voltage and the test input voltage is calculated to obtain the adjusted voltage value, and the transformer output voltage is adjusted according to the adjusted voltage value. If not, a low voltage alarm is directly issued.

[0085] The voltage adjustment module 14 is connected to the alarm module 15, and the alarm module 15 is used to determine whether the adjusted voltage value exceeds the voltage regulation range of the transformer. When the adjusted voltage value does not exceed the voltage regulation range of the transformer, the transformer is adjusted. When the adjusted voltage value exceeds the voltage regulation range of the transformer, the transformer is no longer adjusted and a low voltage alarm is issued.

[0086] The advantage of Embodiment 2 over Embodiment 1 is that when low voltage occurs, the low voltage can be automatically adjusted according to the actual situation of the substation, providing automated protection for the stability of the substation power grid operation. At the same time, self-checking can be used to issue alarms about situations where automatic adjustment cannot be made, prompting operation and maintenance personnel to inspect the lines.

[0087] A method for using a low voltage analysis platform for a substation based on a digital model specifically comprises the following steps:

[0088] S1. Use the data acquisition module 6 to collect the laying path, length, branch information of the substation line, the transformer location and its voltage regulation range information, as well as the line material information and the diameter of the line conductor as the real substation information. According to the real substation information, a three-dimensional simulation model of human-computer interaction is built through the modeling interaction module 7.

[0089] S2. Node marking is performed at the line branches in the three-dimensional simulation model through the substation division module 8, and the node marking is divided into the total node marking on the trunk line and the branch node marking on the branch line. A voltage acquisition and transmission module 9 composed of a voltage sensor and a current sensor is arranged at the output end of the transformer and the end of the branch line, and a voltage acquisition and transmission module 9 composed of a voltage sensor and a current sensor is arranged in the substation corresponding to the total node marking and the branch node marking. The voltage acquisition and transmission module 9 is used to collect real-time voltage and current information on the output end of the transformer, the trunk line, the branch line and the end of the branch line, and the collected voltage and current information is transmitted to the three-dimensional simulation model.

[0090] S3. In the three-dimensional simulation model, three groups of test input voltages A, B, and C and test comparison voltages are set by the power simulation module 10 to perform simulation tests:

[0091] Group A includes: using the voltage information collected at the output end of the transformer as the test input voltage, and using the voltage information collected at the main node mark corresponding to the trunk line as the test comparison voltage;

[0092] Group B includes: for using the voltage information collected at the main node mark as the test input voltage, and using the voltage information collected at the branch node mark corresponding to the main node mark as the test comparison voltage;

[0093] Group C includes: also used to use the voltage information collected at the branch node mark as the test input voltage, and the voltage information collected at the end of the corresponding branch line as the test comparison voltage;

[0094] The voltage error threshold is set as the standard threshold, and the three groups of test input voltages are respectively input into the three-dimensional simulation model using the line diagnosis module 11. According to the line material information and the diameter of the line conductor, the ideal voltage corresponding to the three groups of test comparison voltage collection points is calculated. After the difference between the ideal voltage and the test comparison voltage is calculated, the absolute value of the difference is compared with the standard threshold. When the absolute value of the difference is less than or equal to the standard threshold, it is judged that the corresponding line of this group is normal. On the contrary, when the absolute value of the difference is greater than the standard threshold, it is judged that the corresponding line of this group is abnormal. After marking the abnormal line, an abnormal alarm is issued. When a line abnormality occurs, the loss analysis module 12 is used to calculate the actual resistance of the abnormal line.

[0095] S4. According to the actual resistance, the voltage adjustment module 14 adjusts the test comparison voltage to a normal voltage value as a target value, calculates the ideal test input voltage, and determines whether the ideal test input voltage is within the safe transmission voltage range of the corresponding line:

[0096] Yes, calculate the absolute value of the difference between the ideal test input voltage and the test input voltage, obtain the adjustment voltage value, and adjust the voltage at the output end of the transformer according to the adjustment voltage value;

[0097] No, a low voltage alarm will be issued directly.

[0098] S5. Determine whether the adjusted voltage value exceeds the transformer voltage regulation range through the alarm module 15:

[0099] When the adjusted voltage value does not exceed the voltage regulation range of the transformer, perform transformer regulation;

[0100] When the adjusted voltage value exceeds the voltage regulation range of the transformer, the transformer will no longer be adjusted and a low voltage alarm will be issued.

Claims

1. A low voltage analysis platform for a substation based on a digital model, including a substation simulation platform, characterized in that: The substation simulation platform includes a model building unit, a data monitoring unit, a model control unit and a substation adjustment unit. The model building unit is used to build a three-dimensional simulation model according to real substation information. The model building unit is connected to the data monitoring unit. The data monitoring unit is used to mark nodes of substation lines in the three-dimensional simulation model and collect voltage and current information at corresponding node marks in the substation lines. The model building unit is connected to the model control unit. The model control unit is used to perform simulation tests in the three-dimensional simulation model according to the collected voltage and current information. The model control unit is connected to the substation adjustment unit. The substation adjustment unit is used to automatically adjust the transformer according to the simulation test results. The model control unit includes a power consumption simulation module, a line diagnosis module and a loss analysis module, the power consumption simulation module is connected to the line diagnosis module, and the line diagnosis module is connected to the loss analysis module; The power consumption simulation module is used to formulate three groups of test input voltages A, B, and C and test comparison voltages to perform simulation tests; The line diagnosis module is used to set the voltage error threshold as the standard threshold, input the three groups of test input voltages into the three-dimensional simulation model to obtain the ideal voltage, calculate the difference between the ideal voltage and the test comparison voltage, and when the absolute value of the difference is less than or equal to the standard threshold, judge that the corresponding line of the group is normal, otherwise, judge that the corresponding line of the group is abnormal, mark the abnormal line, and issue an abnormal alarm; The loss analysis module is used to calculate the actual resistance of the abnormal line when a line abnormality occurs; The station area adjustment unit includes a data recording module, a voltage adjustment module and an alarm module, wherein the data recording module is connected to the voltage adjustment module, and the voltage adjustment module is connected to the alarm module; the data recording module is used to record the simulation test information corresponding to the collected voltage and current information, the test debugging information includes the input voltage, the test comparison voltage and the ideal voltage, and obtains the line safe transmission voltage range value according to the line material information, the diameter of the line conductor and the line length; The voltage adjustment module is used to adjust the test comparison voltage to a normal voltage value as a target value according to the actual resistance, calculate the ideal test input voltage, and determine whether the ideal test input voltage is within the safe transmission voltage range of the corresponding line. If yes, the voltage at the output end of the transformer is adjusted, otherwise, a low voltage alarm is directly issued; The alarm module is used to determine whether the adjusted voltage value exceeds the transformer voltage regulation range. When the adjusted voltage value does not exceed the transformer voltage regulation range, the transformer is adjusted. When the adjusted voltage value exceeds the transformer voltage regulation range, the transformer is no longer adjusted and a low voltage alarm is issued.

2. According to the digital model-based low voltage analysis platform of claim 1, it is characterized by: The model building unit includes a data acquisition module and a modeling interaction module, and the data acquisition module is connected to the modeling interaction module; The ideal voltage is specifically inputting three groups of test input voltages into the three-dimensional simulation model respectively, and calculating the ideal voltage corresponding to the three groups of test comparison voltage collection points according to the line material information and the diameter of the line conductor; After the difference between the ideal voltage and the test comparison voltage is calculated, the absolute value of the difference is compared with the standard threshold to determine whether the line is abnormal; The specific operation of adjusting the voltage at the output end of the transformer is: if it is determined that the ideal test input voltage is within the safe transmission voltage range of the corresponding line, the absolute value of the difference between the ideal test input voltage and the test input voltage is calculated to obtain the adjustment voltage value, and the voltage at the output end of the transformer is adjusted according to the adjustment voltage value.

3. The low voltage analysis platform for substations based on digital models according to claim 2 is characterized by: The data acquisition module is used to collect the laying path, length, branch information of the substation line, the location of the transformer and its voltage regulation range information, as well as the line material information and the diameter of the line conductor as the real substation information; The modeling interaction module is used to build a three-dimensional simulation model of human-computer interaction based on real station area information.

4. The low voltage analysis platform for substations based on a digital model according to claim 3 is characterized by: The data monitoring unit includes an area division module and a voltage acquisition and transmission module, and the area division module is connected to the voltage acquisition and transmission module.

5. The low voltage analysis platform for substations based on digital models according to claim 4 is characterized by: The station area division module is used to mark nodes at line branches in the three-dimensional simulation model, and divide the node marks into total node marks on the trunk line and branch node marks on the branch line; The voltage acquisition and transmission module is used to arrange voltage sensors and current sensors at the output end of the transformer and the end of the branch line, and to arrange voltage sensors and current sensors in the substations corresponding to the main node mark and the branch node mark, to collect real-time voltage and current information on the output end of the transformer, the main line, the branch line and the end of the branch line, and to transmit the collected voltage and current information to the three-dimensional simulation model.

6. The low voltage analysis platform for substations based on digital models according to claim 5 is characterized by: The power consumption simulation module is used to formulate three groups of test input voltages A, B, and C and test comparison voltages. The specific method of performing the simulation test is as follows: Group A includes: using the voltage information collected at the output end of the transformer as the test input voltage, and using the voltage information collected at the main node mark corresponding to the trunk line as the test comparison voltage; Group B includes: for using the voltage information collected at the main node mark as the test input voltage, and using the voltage information collected at the branch node mark corresponding to the main node mark as the test comparison voltage; Group C includes: also used to use the voltage information collected at the branch node mark as the test input voltage, and the voltage information collected at the end of the corresponding branch line as the test comparison voltage; The formula for calculating the actual resistance of the abnormal line is: P1=V1*I P2=V2*I P3=P2-P1 In the formula, P1 is the input power, V1 is the test input voltage, I is the current, P2 is the output power, V2 is the test comparison voltage, and P3 is the loss power; Calculate the actual resistance corresponding to group A circuit according to the power loss: P3=I 2 *R Where P3 is the power loss, I is the current, and R is the actual resistance.

7. The low voltage analysis platform for substations based on digital models according to claim 6 is characterized by: The specific method of using the platform includes the following steps: S1. Using the data acquisition module to collect the laying path, length, branch information of the substation line, the location of the transformer and its voltage regulation range information, as well as the line material information and the diameter of the line conductor, as the real substation information, a three-dimensional simulation model of human-computer interaction is built through the modeling interaction module according to the real substation information; S2. Mark nodes at line branches in the three-dimensional simulation model through the substation division module, and divide the node marks into total node marks on the trunk line and branch node marks on the branch line. A voltage acquisition and transmission module composed of a voltage sensor and a current sensor is arranged at the output end of the transformer and the end of the branch line, and a voltage acquisition and transmission module composed of a voltage sensor and a current sensor is arranged in the substation corresponding to the total node mark and the branch node mark. The voltage acquisition and transmission module is used to collect real-time voltage and current information of the transformer output end, the trunk line, the branch line and the end of the branch line, and the collected voltage and current information is transmitted to the three-dimensional simulation model; S3. In the three-dimensional simulation model, three groups of test input voltages A, B, and C and test comparison voltages are proposed through the power simulation module to conduct simulation tests: Group A includes: using the voltage information collected at the output end of the transformer as the test input voltage, and using the voltage information collected at the main node mark corresponding to the trunk line as the test comparison voltage; Group B includes: for using the voltage information collected at the main node mark as the test input voltage, and using the voltage information collected at the branch node mark corresponding to the main node mark as the test comparison voltage; Group C includes: also used to use the voltage information collected at the branch node mark as the test input voltage, and the voltage information collected at the end of the corresponding branch line as the test comparison voltage; The voltage error threshold is set as the standard threshold, and the three groups of test input voltages are respectively input into the three-dimensional simulation model using the line diagnosis module. According to the line material information and the diameter of the line conductor, the ideal voltage corresponding to the three groups of test comparison voltage collection points is calculated. After the ideal voltage and the test comparison voltage are calculated for difference, the absolute value of the difference is compared with the standard threshold. When the absolute value of the difference is less than or equal to the standard threshold, the corresponding line of this group is judged to be normal. On the contrary, when the absolute value of the difference is greater than the standard threshold, the corresponding line of this group is judged to be abnormal. After marking the abnormal line, an abnormal alarm is issued. When a line abnormality occurs, the actual resistance of the abnormal line is calculated using the loss analysis module. S4. According to the actual resistance, the voltage adjustment module adjusts the test comparison voltage to the normal voltage value as the target value, calculates the ideal test input voltage, and determines whether the ideal test input voltage is within the safe transmission voltage range of the corresponding line: Yes, calculate the absolute value of the difference between the ideal test input voltage and the test input voltage, obtain the adjustment voltage value, and adjust the voltage at the output end of the transformer according to the adjustment voltage value; No, a low voltage alarm will be issued directly; S5. Use the alarm module to determine whether the adjusted voltage value exceeds the transformer voltage regulation range: When the adjusted voltage value does not exceed the voltage regulation range of the transformer, perform transformer regulation; When the adjusted voltage value exceeds the voltage regulation range of the transformer, the transformer will no longer be adjusted and a low voltage alarm will be issued.

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